#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	printf("       *\n");
	printf("      ***\n");
	printf("     *****\n");
	printf("    *******\n");
	printf("   *********\n");
	printf("  ***********\n");
	printf(" *************\n");
	printf("***************\n");
	printf(" *************\n");
	printf("  ***********\n");
	printf("   *********\n");
	printf("    *******\n");
	printf("     *****\n");
	printf("      ***\n");
	printf("       *\n");





	return 0;
}